Mercedes W124

since 1985-1995 of release

Repair and car operation



W124 Mercedes
+ Governing bodies and control devices
+ MAINTENANCE
+ 2. Maintenance (diesel engines)
+ ENGINE
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
- 6. Repair of the diesel engine established in the car
   6.2. General information
   6.3. Repair operations on the engine established in the car
   6.4. Check of pressure of compression
   6.5. Top dead point (VMT) of the piston of the first cylinder
   6.6. Cover of a head of the block of cylinders
   6.7. Pulley cranked shaft / quencher of krutilny fluctuations and nave
   6.8. Cover of a driving chain
   6.9. Driving chain
   + 6.10. Mechanism of a tension of a driving chain, asterisk and uspokoitel of a chain
   + 6.11. Camshafts and pushers
   6.12. Head of the block of cylinders
   6.13. Oil pallet
   6.14. Oil pump and driving chain
   6.15. Drive flywheel / plate
   6.16. Replacement of sealing rings of a cranked shaft
+ 7. Major maintenance of engines
+ COOLING SYSTEM
+ FUEL SYSTEM
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
+ 12. Fuel system of diesel engines
+ 13. Fuel system of diesel engines
+ SYSTEMS OF START, IGNITION
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ PRESTARTING HEATING
+ TRANSMISSION
+ 19. Mechanical transmission
+ 20. Automatic transmission
+ POWER SHAFTS
+ BRAKE SYSTEM
+ SUSPENSION BRACKET
+ BODY
+ ELECTRIC EQUIPMENT
+ CHECK OF MALFUNCTIONS



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6.12. Head of the block of cylinders

GENERAL INFORMATION

Prevention

For removal of a head of the block of cylinders it is necessary to use the load-lifting mechanism. At installation of a head of the block of cylinders it is necessary to use new laying. For fastening of the bearing of the camshaft operating inlet valves, it is necessary to use a new bolt.


Head of the block of cylinders

1–head of the block of cylinders;
2–bearing cover;
3–vortical chamber;
4–nut of fastening of the vortical chamber;
5–directing valves;
6–maslootrazhatelny caps;
7–saddles of valves;
8–cover of a head of the block of cylinders;
9–laying of a cover of a head of the block of cylinders


Elements of the mechanism of a tension of an auxiliary driving belt
1–plastic cover;
2–bolt;
3–intermediate pulley;
4–bolt;
5–radiator fan;
6–bolts;
7–amortization rack of the mechanism of a tension;
8–springs;
9–plastic cap;
10-bolt;
10а – a bolt of other execution;
11-plug;
12-tension mechanism;
12а – the mechanism of a tension of other execution;
13-laying

Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 4-cylinder diesel engine

Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 5-cylinder diesel engine

Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 6-cylinder diesel engine

Connection places топливопроводов to the fuel filter

Place of connection of a hose to the valve of system of repeated burning of exhaust gases

Use of the special tool (1) for release of a fixing bracket (2) from connection of a cranked branch pipe of cooling liquid with an oil radiator

PERFORMANCE ORDER
1. The head of the block of cylinders acts in film on the cold engine together with collectors.
2. Remove a weight wire from the accumulator.
3. Open a cowl and establish it in vertical situation.
4. Merge from the engine engine oil.
5. Remove a camshaft.
6. Remove fuel nozzles.
7. Remove a radiator.
8. Remove the mechanism of a tension of an auxiliary driving belt (see fig. Elements of the mechanism of a tension of an auxiliary driving belt).
9. Remove a plastic cap, unscrew a bolt and remove an intermediate pulley of an auxiliary driving belt.
10. Unscrew bolts and remove a pulley of the fan of a radiator.
11. Unscrew bolts and remove amortization this rack of the mechanism of a tension.
12. Using flat-nose pliers, remove a spring of the mechanism of a tension.
13. Remove a plastic cap, unscrew a bolt and remove the mechanism of a tension of an auxiliary driving belt.
14. On models without a turbo-supercharging uncover the air filter, a tube of an air inlet and filtering element of the air filter.
15. On models with a turbonagnetatel remove an air inlet branch pipe from a turbonagnetatel.
16. Unscrew a suspension bracket of an arm of a turbonagnetatel.
17. Unscrew a nut and disconnect from a head of the block of cylinders the pipeline of return of oil of a turbonagnetatel.
18. Dispose pure rags under connection топливопровода to the fuel filter. Then unscrew nuts and disconnect топливопроводы (see fig. Connection places топливопроводов to the fuel filter). Close the ends of pipelines jams.
19. Unscrew the fuel filter from a head of the block of cylinders.
20. Unscrew a pipe for щупа measurements of level of engine oil from a head of the block of cylinders.
21. Remove a hose from the valve of system of repeated burning of exhaust gases (see fig. A place of connection of a hose to the valve of system of repeated burning of exhaust gases).
22. Working under the car, unscrew the bolts, supports of an exhaust system fixing an arm to a transmission, then unscrew bolts and remove an arm from an exhaust system.
23. Disconnect a reception exhaust pipe from an inlet collector.
24. Using the special tool, disconnect fixing bracket from connection of a cranked branch pipe of cooling liquid and an oil radiator (see fig. Use of the special tool for release of a fixing bracket from connection of a cranked branch pipe of cooling liquid with an oil radiator).
25. Unscrew a cranked branch pipe from an oil radiator, then disconnect it from a connector.
26. Unscrew the nuts, fixing feeding tire to glow plugs.
27. Remove an inlet collector.
28. Remove the top uspokoitel of a driving chain.
29. Through an opening in a head of the block of cylinders unscrew two bolts, fixing a head of the block of cylinders to a cover of a driving chain (see fig. An arrangement of bolts of fastening of a cover of a driving chain to a head of the block of cylinders).
30. Check that all hoses and electric sockets are disconnected from a head of the block of cylinders.
31. Gradually and evenly unscrew bolts of fastening of a head of the block of cylinders in sequence, return shown in drawings Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 4-cylinder diesel engine, Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 5-cylinder diesel engine, Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 6-cylinder diesel engine.
32. Take bolts of fastening of a head of the block of cylinders, noting their arrangement as bolts of various length are used.
33. Hook slings of the load-lifting mechanism for the eyes located from the left forward party of a head of the block of cylinders and from back right on a final collector, and remove a head of the block of cylinders from the engine.
34. Remove laying of a head of the block of cylinders.

Preparation for installation

Measurement of length of a bolt of fastening of a head of the block of cylinders

PERFORMANCE ORDER
1. Interfaced surfaces of a head and the block of cylinders of the engine are necessary for clearing carefully of the remains of old laying and a deposit, using a plastic or wooden scraper. It is also necessary to clear the top parts of pistons. When cleaning exclude possibility of products of cleaning to oil canals of system of cooling. Carefully clear internal surfaces of cylinders.
2. Check surfaces of interface of a head and the block of cylinders of the engine on existence of defects. Insignificant damage is eliminated with machining. Also using a metal ruler and щуп, check planeness of a prileganiye of surfaces.
3. Clear openings under bolts in the block. Bolt screwing up in the opening filled with oil can break off the block because of hydraulic pressure.
4. Measure length of bolts of fastening of a head of the block of cylinders (see fig. Measurement of length of a bolt of fastening of a head of the block of cylinders). If the length of a bolt exceeds admissible limits, it is necessary to replace bolts in a set.

Installation

PERFORMANCE ORDER
1. Check that adjusting labels of distributive and cranked shaft are combined with indexes.
2. Check that two directing pins are established in the block of cylinders and establish laying of a head of the block of cylinders.
3. Using the load-lifting mechanism, establish a head of the block of cylinders.
4. Grease bolts of fastening of a head of the block of cylinders with engine oil, insert them into a head and tighten by hand.
5. Gradually and consistently in some stages tighten bolts of fastening of a head of the block of cylinders (see fig. Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 4-cylinder diesel engine, Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 5-cylinder diesel engine, Sequence of a tightening of bolts of fastening of a head of the block of cylinders on the 6-cylinder diesel engine).
6. Screw in and tighten the demanded moment bolts of fastening of a cover of a driving chain to a head of the block of cylinders.
7. Establish the top uspokoitel of a chain.
8. Establish an inlet collector.
9. Establish feeding tire on glow plugs and fix nuts.
10. Moisten in pure cooling liquid a new sealing ring and establish it on a cranked branch pipe. Establish a cranked branch pipe on an oil radiator and fix a fixing bracket.
11. Connect a reception exhaust pipe to a final collector.
12. Establish an arm of fastening of an exhaust system to a transmission and fix bolts.
13. Further installation is made in sequence, return to removal taking into account the next moments.
14. Establish the mechanism of a tension of an auxiliary driving belt in sequence, return to removal.
15. Fill in cooling liquid in system of cooling of the engine.
16. Fill in in the engine engine oil.